Silicon is useful in microprocessors because it is a
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Superconductor
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Semiconductor
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Insulator
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Electrical Disruptor
Silicon is a semiconductor, meaning its electrical conductivity can be controlled and is between that of a conductor and insulator. This property allows it to be used in transistors and integrated circuits. It can be 'doped' to precisely control its electrical properties for switching and amplification.
Silicon is a semiconductor, correct. Its electrical conductivity lies between that of a conductor and an insulator, and crucially it can be precisely controlled by doping (adding small amounts of other elements) to create regions of excess electrons (n-type) or electron holes (p-type). This controllable conductivity is exactly what allows transistors and logic gates to be built, making silicon the foundation of microprocessors. It is not a superconductor (which has zero electrical resistance, only under extreme conditions), not a pure insulator (it does conduct, just weakly/adjustably), and 'electrical disruptor' isn't a real materials-science category.